[PATCH v4 0/2] mm: slub: Enhanced debugging in slub error

Hyesoo Yu
2025-02-26T08:14:04Z

Dear Maintainer,

The purpose is to improve the debugging capabilities of the slub allocator
when a error occurs. The following improvements have been made:

- Added WARN() calls at specific locations (slab_err, object_err) to detect
errors effectively and to generate a crash dump if panic_on_warn is enabled.

- Additionally, the error printing location in check_object has been adjusted to
display the broken data before the restoration process. This improvement
allows for a better understanding of how the data was corrupted.

This series combines two patches that were discussed seperately in the links below.
https://lore.kernel.org/linux-mm/20250120082908.4162780-1-hyesoo.yu@samsung.com/
https://lore.kernel.org/linux-mm/20250120083023.4162932-1-hyesoo.yu@samsung.com/

Thanks you.

version 2 changes
- Replaced direct calling of BUG_ON with the use of WARN() to trigger a panic.
- Modified the code to print the broken data only once before the restore.

version 3 changes
- Moved WARN() from slab_fix to slab_err and object to call WARN on all error
reporting paths.
- Changed the parameter type of check_bytes_and_report.

version 4 changes
- Modified the print format to include specific error names.
- Removed the redundant warning by removing WARN() in kmem_cache_destroy

Hyesoo Yu (2):
mm: slub: Print the broken data before restoring slub.
mm: slub: call WARN() when the slab detect an error

mm/slab_common.c | 3 ---
mm/slub.c | 63 +++++++++++++++++++++++++-----------------------
2 files changed, 33 insertions(+), 33 deletions(-)

--
2.28.0